JP2012024116A - Negative pressure therapeutic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a negative pressure therapeutic device capable of simplifying an adding operation of a cleaning liquid to be supplied to a wound area W and excellent in portability.SOLUTION: The negative pressure therapeutic device 10 is composed of: a sending pump 2 for sending a fluid (cleaning liquid) supplied through a supplying channel 1 to a closed space formed by covering the wound area W with a covering sheet S through a sending tube 3; a sucking pump 5 for sucking the fluid (cleaning liquid and body fluid) from the closed space through a sucking tube 4 while keeping the closed space in a negative pressure state; a circulating channel 6 for returning the sucked fluid to the feeding channel 1; a filter 8 for filtering the sucked fluid; a turbidity sensor 91 for detecting the turbidity of the sucked fluid; and a valve controller 71 for controlling a switching valve 7 depending on the turbidity.

Description

  The present invention relates to a negative pressure treatment device.

  Conventionally, as a negative pressure treatment device, a wound space such as a skin ulcer or tissue defect is covered with a covering sheet to form a closed space around the wound portion, and a cleaning solution is supplied into the closed space, while a negative pressure is applied to the closed space. 2. Description of the Related Art A treatment device that sucks a body fluid that exudes from a wound portion together with a cleaning liquid while maintaining the state is known (for example, see Patent Documents 1 and 2 below).

  According to such a negative pressure treatment device, the wound part can be washed to remove necrotic cells, bacteria, and the like from the wound part, and the negative blood pressure can promote blood flow in the wound part to enhance the healing effect.

Special table 2008-538662 gazette Special table 2007-509683

  By the way, when this negative pressure treatment is performed, a large amount of washing liquid is required particularly in the initial stage of treatment. For this reason, conventionally, it has been necessary to frequently perform a cleaning liquid replenishment operation, such as replacement of a cleaning liquid bag, and there is a problem that it takes time and effort. Further, since a cleaning liquid bag having a relatively large capacity is used, there is a problem that the portability of the apparatus is lowered.

  The present invention was made in view of the above-described drawbacks of conventional negative pressure treatment devices, and can provide a negative pressure treatment device that can save labor for replenishment of cleaning liquid and the like and is excellent in portability. The purpose is to do.

  The present invention provides a delivery pump for delivering a fluid supplied through a supply flow path through a delivery tube into a closed space formed by covering a wound portion with a covering sheet, and the closed space while maintaining the closed space in a negative pressure state. A suction pump that sucks fluid from the suction tube, one end side is connected to the suction tube, the other end side is connected to the supply flow path via a switching valve, and the fluid sucked through the suction tube is supplied to the supply flow path A return flow path, a filtering means provided in the circulation flow path for filtering the sucked fluid, a turbidity sensor provided in the suction tube or the circulation flow path for detecting the turbidity of the sucked fluid, Valve control means for controlling the switching valve in accordance with the turbidity detected by the turbidity sensor.

  Further, the present invention is characterized by comprising pump control means for controlling the delivery pump according to the turbidity detected by the turbidity sensor.

  Further, the present invention provides the turbidity sensor for detecting the turbidity of the sucked fluid in the suction tube or the circulation channel, and the delivery pump according to the turbidity detected by the other turbidity sensor. It is characterized by having a pump control means for controlling the above.

  Furthermore, the turbidity sensor is provided on the downstream side of the filtering means in the circulation channel, and the other turbidity sensor is provided on the upstream side of the filtering means in the circulation channel. It is a feature.

  Furthermore, the present invention provides the suction tube or the circulation channel with a detection channel in which a pair of channel walls facing each other are formed in parallel, and the turbidity of the fluid flowing through the detection channel is measured. It is characterized in that it is detected by the turbidity sensor or the other turbidity sensor at the channel wall.

  Furthermore, the present invention is characterized in that a waste flow path for discarding the sucked fluid to the outside is provided on the upstream side of the filtering means in the circulation flow path.

  Furthermore, the present invention is characterized in that a circulation pump for sucking fluid from the filtration means side is provided on the downstream side of the filtration means in the circulation flow path.

  According to the negative pressure treatment device according to the present invention, the fluid sucked from the wound part can be filtered by the filtering means without being discarded as it is and supplied to the wound part again through the circulation channel and the switching valve. The amount of cleaning liquid used can be greatly reduced. Therefore, the number of times of replacement of the cleaning liquid bag can be reduced, and the replenishment work of the cleaning liquid can be greatly saved. Moreover, as a result of using a cleaning liquid bag having a relatively large capacity as in the prior art, a negative pressure treatment device with excellent portability can be provided without the difficulty of reducing the portability of the device.

  Moreover, since the turbidity of the fluid sucked from the wound part can be detected by a turbidity sensor and the switching valve can be controlled in accordance with the turbidity, the cleaning liquid can be used more efficiently.

  In addition, by controlling the delivery pump according to the turbidity of the fluid sucked from the wound part, for example, it is possible to immediately adjust the delivery amount of the cleaning liquid by the delivery pump according to the degree of body fluid exudation of the wound part, This also reduces the amount of cleaning liquid used.

  If a detection channel is provided in the suction tube or the circulation channel, the detection accuracy can be increased by detecting the turbidity of the fluid flowing through the detection channel with a turbidity sensor.

  Further, if a waste flow path for discarding the sucked fluid to the outside is provided on the upstream side of the filtering means in the circulation flow path, the fluid sucked from the wound portion contains a relatively large amount of body fluid, for example, at the initial stage of treatment. In some cases, the fluid can be discarded to the outside through the disposal channel without being filtered by the filtering means and re-supplied to the wound.

  Further, if a circulation pump for sucking fluid from the filtration means side is provided downstream of the filtration means in the circulation channel, the fluid can be circulated smoothly and stably regardless of the suction force by the suction pump 5 and the resistance of the filtration means. Negative pressure treatment can be performed.

1 is a schematic overall view showing a negative pressure treatment apparatus of an embodiment. It is a schematic sectional drawing which shows the closed space formed in the wound part. It is the (a) top view and (b) side view of the detection flow path of the negative pressure treatment apparatus of this embodiment. It is a schematic whole figure which shows the modification of the negative pressure treatment apparatus which concerns on this invention. It is a schematic whole view which shows the other modification of the negative pressure treatment apparatus which concerns on this invention. It is a general | schematic whole view which shows the other modification of the negative pressure treatment apparatus which concerns on this invention.

  As shown in FIG. 1, the negative pressure treatment device 10 of the present embodiment mainly includes a delivery pump 2 that delivers fluid (cleaning fluid) through a delivery tube 3 to a wound portion W such as a skin ulcer or a tissue defect, and a wound portion W. A suction pump 5 for sucking fluid (cleaning fluid and body fluid) through the suction tube 4, a circulation channel 6 and a switching valve 7 for supplying the sucked fluid to the delivery pump 2 again, and a filtering means for filtering the fluid in the circulation channel 6 8, one turbidity sensor 91 that detects the turbidity of the fluid filtered by the filtering means 8, another turbidity sensor 93 that detects the turbidity of the fluid before filtration, and one turbidity sensor 91. A valve control means 71 for controlling the switching valve 7 according to the turbidity of the fluid, and a pump control means 21 for controlling the delivery pump 2 according to the turbidity of the fluid detected by the other turbidity sensor 93. ing.

  As shown in FIG. 2, the wound portion W is provided with a porous pad P that is flexible and permeable to fluid (cleaning liquid), and a covering sheet S is attached so as to cover the wound portion W and the pad P. Yes. The covering sheet S forms a substantially airtight closed space C around the wound portion W, and the distal end openings of the delivery tube 3 and the suction tube 4 are drawn into the closed space C in advance.

  As shown in FIG. 1, the delivery pump 2 delivers the fluid (cleaning fluid) supplied from the cleaning fluid bag B through the supply flow path 1 into the closed space C through the delivery tube 3. In the present embodiment, a tube pump is used as the delivery pump 2 to sequentially squeeze a flexible tube forming at least a part of the supply flow path 1 with a rotary head to send fluid in the tube. By controlling the rotation of the rotary head of the tube pump, the fluid can be sent out at a set flow rate. In addition, as the delivery pump 2, other metering pumps, such as a piston pump, a diaphragm pump, a vane pump, can also be employ | adopted, for example. Moreover, as a washing | cleaning liquid, what added the required chemical | medical agent etc. to the physiological saline and physiological saline, for example can be employ | adopted.

  The suction pump 5 sucks fluid (cleaning fluid and body fluid exuded from the wound part W) from the closed space C while keeping the closed space C in a negative pressure state through the suction tube 4. In the present embodiment, a diaphragm type vacuum pump is employed as the suction pump 5, and the fluid is sucked by reducing the pressure in the storage tank 61 detachably provided in the middle of the circulation flow path 6. The sucked fluid is temporarily stored in the storage tank 61. The suction pump 5 is controlled by control means (not shown) according to the negative pressure in the closed space C detected by the pressure sensor 51, and can maintain the negative pressure in the closed space C at a set level. As the suction pump 5, other pumps such as a tube pump and a vane pump can also be employed.

  The circulation channel 6 has one end connected to the suction tube 4 and the other end connected to the supply channel 1 via the switching valve 7 to return the fluid sucked through the suction tube 4 to the supply channel 1. It is a flow path. A filtering means 8 is provided on the downstream side of the storage tank 61 in the circulation channel 6 to filter the sucked fluid (cleaning liquid and body fluid). The filtering means 8 of the present embodiment removes, for example, necrotic cells, bacteria, and other substances harmful to treatment from the fluid, and allows cell matrix components, growth factors, physiologically active substances, and other substances useful for treatment to pass along with the washing liquid. .

  The switching valve 7 can switch between supplying the fluid in the circulation flow path 6 filtered by the filtering means 8 to the delivery pump 2 or supplying the fluid stored in the cleaning liquid bag B to the delivery pump 2. For example, the switching valve 7 can be repeatedly switched after supplying the fluid in the circulation channel 6 to the delivery pump 2 for 2 seconds and then supplying the fluid in the cleaning liquid bag B to the delivery pump 2 for 1 second. Moreover, the intermittent opening and closing which supplies the fluid of the circulation flow path 6 or the fluid of the liquid purification bag B to the delivery pump 2 for 2 second and stops the supply for 1 second can also be performed repeatedly. Further, by controlling the opening degree of the switching valve 7, the ratio between the supply amount of the fluid in the cleaning liquid bag B and the supply amount of the fluid in the circulation channel 6 can be changed.

  One turbidity sensor 91 is disposed on the downstream side of the filtering means 8 in the circulation channel 6 and detects the turbidity of the fluid filtered by the filtering means 8. In the present embodiment, a transmissive laser sensor is employed as the turbidity sensor 91, and the amount of transmitted light that has passed through the fluid is detected to detect a change in turbidity such as dirt or color density of the fluid.

  In the present embodiment, as shown in FIGS. 1 and 3, a detection flow path 92 in which a pair of flow path wall portions (921, 922) facing each other is formed in the middle of the circulation flow path 6, The turbidity of the fluid flowing through the detection flow path 92 is detected by the turbidity sensor 91. The detection flow path 92 of this embodiment is formed from a transparent glass material or a hard synthetic resin material, and the flow path cross section has a rectangular shape. By detecting the transmitted light that has passed through the flow path wall portions (921, 922) parallel to each other of the detection flow path 92 with the turbidity sensor 91, the detection accuracy is improved. Moreover, since the detection flow path 92 is transparent, the circulation flow path 6 does not necessarily have translucency, and the material of the circulation flow path 6 is not restricted. The inner surface of the detection channel 92 is preferably coated with an anticoagulant such as heparin.

  The turbidity sensor 91 that detects the turbidity of the fluid after filtration in the circulation channel 6 outputs a detection signal to the valve control means 71, and the valve control means 71 switches or opens the switching valve 7 in accordance with the detection signal. Control the degree.

  As shown in FIG. 1, the other turbidity sensor 93 is arranged on the upstream side of the filtering means 8 in the circulation channel 6 and detects the turbidity of the fluid before being filtered by the filtering means 8. The turbidity sensor 93 is also composed of a transmission type laser sensor. Further, a detection flow path 94 that is the same as the detection flow path 92 is provided in the middle of the circulation flow path 6, and the turbidity of the fluid flowing through the detection flow path 94 is measured by the turbidity sensor. 93.

  The turbidity sensor 93 that detects the turbidity of the fluid before filtration in the circulation channel 6 outputs a detection signal to the pump control means 21, and the pump control means 21 responds to the detection signal and the fluid delivery amount of the delivery pump 2. To control.

  Thus, the negative pressure treatment device 10 of this embodiment operates the delivery pump 2 to deliver the fluid (cleaning fluid) in the cleaning fluid bag B set in advance into the closed space C of the wound portion W while delivering the fluid at a set flow rate. 5 is operated to suck the body fluid exuding from the wound portion W together with the washing liquid while keeping the closed space C in the negative pressure state at the set level. Then, the negative pressure treatment is performed by supplying the sucked fluid to the delivery pump 2 again through the circulation channel 6 and the switching valve 7 while filtering the filtered fluid.

  Note that when the suction pump 5 is operated to depressurize the storage tank 61, the suction force to the storage tank 61 side also acts on the fluid in the circulation channel 6 on the downstream side of the storage tank 61, but is circulated by the switching valve 7. If the delivery pump 2 is operated by connecting the passage 6 and the delivery pump 2, the fluid in the circulation passage 6 can be circulated by the suction force of the delivery pump 2.

  Thus, according to the negative pressure treatment device 10 of the present embodiment, the fluid sucked from the wound part W is filtered by the filtering means 8 without being discarded as it is, and is supplied to the wound part W again through the circulation channel 6. Therefore, the amount of cleaning liquid used can be greatly reduced. Therefore, the number of times of replacement of the cleaning liquid bag can be reduced, and the replenishment work of the cleaning liquid can be greatly saved. In addition, since the amount of cleaning liquid used can be reduced, a negative pressure treatment apparatus with excellent portability can be obtained without the disadvantage that the portability of the apparatus decreases as a result of using a relatively large capacity cleaning liquid bag as in the prior art. Can be provided.

  Moreover, since the turbidity of the fluid after filtration is detected by one turbidity sensor 91 and the switching valve 7 can be controlled according to the turbidity, the cleaning liquid can be used more efficiently. In this way, the amount of cleaning liquid used can be reduced.

  Moreover, according to the negative pressure treatment apparatus 10 of this embodiment, the turbidity of the fluid (cleaning liquid and body fluid) before filtration sucked from the wound part W is detected by another turbidity sensor 93, and according to the turbidity. Since the delivery pump 2 can be controlled, for example, the degree of exudation of body fluid in the wound portion W can be grasped, and the amount of cleaning liquid delivered by the delivery pump 2 can be immediately adjusted according to the change in exudation. This also reduces the amount of cleaning liquid used.

  In addition, according to the negative pressure treatment device 10 of the present embodiment, the fluid (cleaning liquid) supplied from the cleaning liquid bag B can be reliably and quantitatively sent out by the delivery pump 2, so that the height position of the cleaning liquid bag B is Does not change the amount of fluid supplied to the closed space C. This also improves the portability of the apparatus.

  As mentioned above, although the negative pressure treatment apparatus 10 of this embodiment was demonstrated, this invention can be implemented also with another form.

  For example, you may implement like the negative pressure treatment apparatus 20 shown in FIG. The negative pressure treatment device 20 is provided with a waste flow path 62 for discarding the fluid (cleaning liquid and body fluid) sucked from the wound part W to the outside as needed on the upstream side of the filtering means 8 in the circulation flow path 6. There is a feature in the point. In general, a relatively large amount of body fluid exudes from the wound part W in the initial stage of treatment. When the fluid sucked from the wound part W contains a relatively large amount of body fluid, the negative pressure treatment device 20 does not re-filter the fluid with the filtering means 8 and re-supply the wound part W. It is configured so that it can be discarded to the outside.

  That is, one end side of the waste flow path 62 is connected to the upstream side of the storage tank 61 in the circulation flow path 6 via the switching valve 63, and the other end side is connected to the waste tank 64. The waste tank 64 is detachably provided and is decompressed by the suction pump 5 to suck the fluid. The switching valve 63 can switch whether the fluid (cleaning fluid and body fluid) of the wound portion W is sucked by the storage tank 61 or the waste tank 64.

  Further, the negative pressure treatment device 20 detects the turbidity of the fluid before being filtered by the filtering means 8 by the turbidity sensor 93, and the valve control means 65 controls the switching of the switching valve 63 according to the detection signal. It is configured.

  Therefore, according to the negative pressure treatment device 20, for example, when the amount of exudation of body fluid is large in the initial stage of treatment or the like, this is detected by the turbidity sensor 93, and the switching valve 63 is switched by the valve control means 65. Cleaning fluid and body fluid) can be aspirated by the waste tank 64 and then the waste tank 64 can be removed and the fluid discarded. When the amount of exudation of body fluid decreases, this is detected by the turbidity sensor 93, and the switching valve 63 is switched by the valve control means 65, whereby the fluid (cleaning fluid and body fluid) can be sucked by the storage tank 61. The fluid can be filtered by the filtering means 8 and re-supplied to the wound portion W.

  In the negative pressure treatment device 20, the waste flow path 62 is provided via the switching valve 63 on the upstream side of the storage tank 61 in the circulation flow path 6, but the present invention is not limited to this. In the negative pressure treatment device 10 of the above embodiment, a waste channel may be provided at the bottom of the storage tank 61 via a switching valve. Moreover, you may provide the suction pump and waste channel for sucking out the fluid in the storage tank 61 outside. In addition, the storage tank 61 that is detachably provided may be manually removed to discard the fluid in the tank. Furthermore, another turbidity sensor other than the turbidity sensor 93 may be provided in the suction tube 4 or the circulation flow path 6, and the detection signal may be output to the valve control means 65 to control the switching valve 63.

  Moreover, you may implement like the negative pressure treatment apparatus 30 shown in FIG. In the negative pressure treatment device 30, the valve control means 72 controls the switching valve 7 in accordance with the detection signal of one turbidity sensor 95 disposed on the upstream side of the filtration means 8 in the circulation flow path 6. The pump control means 21 controls the delivery pump 2 in accordance with the detection signal of the turbidity sensor 95. By making the turbidity sensor for controlling the switching valve 7 and the turbidity sensor for controlling the delivery pump 2 common, the apparatus configuration can be further simplified.

  Moreover, you may implement like the negative pressure treatment apparatus 40 shown in FIG. The negative pressure treatment device 40 is characterized in that a circulation pump 66 for sucking fluid (fluid after filtration) from the filtration means 8 side is provided on the downstream side of the filtration means 8 in the circulation flow path 6. As a result, the fluid can be circulated smoothly and stably on the downstream side of the filtering means 8 in the circulation channel 6 regardless of the suction force by the suction pump 5 and the resistance of the filtering means 8. In addition to the tube pump, a piston pump, a diaphragm pump, a vane pump, or the like can be used as the circulation pump 66. Further, a vacuum pump may be provided in the circulation channel 6 via a liquid reservoir. Further, the suction pump 5 may be connected to the circulation channel 6 via a pressure regulating valve in order to simplify the configuration.

  Moreover, in the said embodiment, as shown in FIG. 1, although the turbidity sensor (91, 93) is provided in the circulation flow path 6, this invention is not limited to this, A turbidity sensor is provided. You may arrange | position to the suction tube 4. FIG. Further, the turbidity sensor is not limited to the transmitted light measurement method, but may be a scattered light measurement method.

  In addition, the present invention can be carried out in a mode in which various improvements, modifications and variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. It may be implemented in a form in which any invention specific matter is replaced with another technology within a range where the same action or effect occurs, or the invention specific matter configured integrally may be constituted by a plurality of members. In addition, the invention specific items constituted by a plurality of members may be implemented in an integrated configuration.

10, 20, 30, 40; negative pressure treatment device 1; supply flow path 2; delivery pump 21; pump control means 3; delivery tube 4; suction tube 5; suction pump 6; circulation flow path 62; Circulating pump 7; Switching valves 71 and 72; Valve control means 8; Filtration means 91, 93 and 95; Turbidity sensors 92 and 94; Detection flow path W; Wound part S; Cover sheet C;

Claims (7)

A delivery pump for delivering the fluid supplied through the supply channel through a delivery tube into a closed space formed by covering the wound with a covering sheet;
A suction pump for sucking fluid from the closed space through a suction tube while keeping the closed space in a negative pressure state;
One end side is connected to the suction tube, the other end side is connected to the supply passage through a switching valve, and a circulation passage that returns the fluid sucked through the suction tube to the supply passage;
A filtering means provided in the circulation channel for filtering the sucked fluid;
A turbidity sensor that is provided in the suction tube or the circulation channel and detects the turbidity of the sucked fluid;
Valve control means for controlling the switching valve according to the turbidity detected by the turbidity sensor;
A negative pressure treatment device comprising:   The negative pressure treatment apparatus according to claim 1, further comprising pump control means for controlling the delivery pump according to turbidity detected by the turbidity sensor.   Pump control means for providing another turbidity sensor for detecting the turbidity of the sucked fluid in the suction tube or the circulation channel, and controlling the delivery pump according to the turbidity detected by the other turbidity sensor The negative pressure treatment device according to claim 1, comprising: The turbidity sensor is provided on the downstream side of the filtering means in the circulation channel;
The negative pressure therapy apparatus according to claim 3, wherein the other turbidity sensor is provided on the upstream side of the filtering means in the circulation channel.   The suction tube or the circulation channel is provided with a detection channel in which a pair of channel walls facing each other are formed in parallel, and the turbidity of the fluid flowing through the detection channel is measured in the channel wall. The negative pressure treatment device according to any one of claims 1 to 4, wherein the negative pressure treatment device is detected by a degree sensor or the other turbidity sensor.   The negative pressure treatment according to any one of claims 1 to 5, further comprising a discarding channel for discarding the aspirated fluid to the outside upstream of the filtering means in the circulation channel. apparatus.   The negative pressure treatment according to any one of claims 1 to 6, further comprising a circulation pump that sucks fluid from the filtration means side downstream of the filtration means in the circulation channel. apparatus.

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